College of Materials Science and Engineering , Kunming University of Science and Technology , Kunming 650093 , China.
ACS Appl Mater Interfaces. 2018 May 2;10(17):14941-14947. doi: 10.1021/acsami.8b03616. Epub 2018 Apr 17.
Reversible luminescence modulation of upconversion phosphors has the potential applications as photoswitches and optical memory and data storage devices. Previously, the photochromic reaction was extensively used for the realization of reversible luminescence modulation. It is very necessary to develop other approaches such as thermomchromic reaction to obtain the reversible upconversion luminescence modulation. In this work, the WO:Yb,Er phosphors with various colors were prepared at various temperatures, exhibiting tunable upconversion luminescence attributed to the formation of oxygen vacancies in the host. Upon heat treatment in the reducing atmosphere or air, the WO:Yb,Er phosphors show a reversible thermomchromic property. The reversible upconversion luminescence modulation of WO:Yb,Er phosphors was observed based on thermomchromic reaction. Additionally, the upconversion luminescence modulation is maintained after several cycles, indicating its excellent stability. The WO:Yb,Er phosphors with reversible upconversion luminescence and excellent reproducibility have potential applications as the photoswitches and optical memory and data storage devices.
上转换荧光粉的可逆发光调制具有作为光开关和光存储及数据存储设备的潜在应用。以前，光致变色反应被广泛用于实现可逆发光调制。开发其他方法，如热致变色反应，以获得可逆的上转换发光调制是非常必要的。在这项工作中，制备了在不同温度下具有不同颜色的 WO:Yb,Er 荧光粉，其归因于基质中形成氧空位而表现出可调谐的上转换发光。在还原气氛或空气中进行热处理时，WO:Yb,Er 荧光粉表现出可逆的热致变色特性。基于热致变色反应，观察到 WO:Yb,Er 荧光粉的可逆上转换发光调制。此外，在几个循环后，上转换发光调制仍保持不变，表明其具有优异的稳定性。具有可逆上转换发光和优异重现性的 WO:Yb,Er 荧光粉具有作为光开关和光存储及数据存储设备的潜在应用。
